Roll src/third_party/skia/ 2bb6ecc11..af1813e3b (2 commits)

https://skia.googlesource.com/skia.git/+log/2bb6ecc11293..af1813e3bf61

$ git log 2bb6ecc11..af1813e3b --date=short --no-merges --format='%ad %ae %s'
2017-07-20 scroggo Update call to new signature of wrapBackendTexture
2017-07-20 egdaniel Fix WrappedProxyTest for sample count change

Created with:
  roll-dep src/third_party/skia


Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+/master/autoroll/README.md

If the roll is causing failures, see:
http://www.chromium.org/developers/tree-sheriffs/sheriff-details-chromium#TOC-Failures-due-to-DEPS-rolls


CQ_INCLUDE_TRYBOTS=master.tryserver.blink:linux_trusty_blink_rel;master.tryserver.chromium.linux:linux_optional_gpu_tests_rel;master.tryserver.chromium.mac:mac_optional_gpu_tests_rel;master.tryserver.chromium.win:win_optional_gpu_tests_rel;master.tryserver.chromium.android:android_optional_gpu_tests_rel
TBR=caryclark@chromium.org

Change-Id: If912997c5bebd61fdf4db20abdcd02cc6f5f2a5d
Reviewed-on: https://chromium-review.googlesource.com/579649Reviewed-by: Skia Deps Roller <skia-deps-roller@chromium.org>
Commit-Queue: Skia Deps Roller <skia-deps-roller@chromium.org>
Cr-Commit-Position: refs/heads/master@{#488262}

DEPS

@@ -40,7 +40,7 @@ vars = {
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling Skia
   # and whatever else without interference from each other.
-  'skia_revision': '2bb6ecc112930e4d16a493fac81d1d92d23fb0ec',
+  'skia_revision': 'af1813e3bf617edc663bef2e5bb07d3f5eb4da2e',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling V8
   # and whatever else without interference from each other.